clock_control: clock_control_nrf.c: Add `size_t` to casts from `void *`

If you compile this code with Clang it will complain about casting a larger
type into a smaller enum.

```C
zephyr/drivers/clock_control/clock_control_nrf.c:120:37:
warning: cast to smaller integer type 'enum clock_control_nrf_type'
from 'clock_control_subsys_t' (aka 'void *') [-Wvoid-pointer-to-enum-cast]
enum clock_control_nrf_type type = (enum clock_control_nrf_type)subsys;
```

Adding `size_t` to the cast removes this issue. Another option could be to
add `-Wno-void-pointer-to-enum-cast` flag to the compile flags.

Signed-off-by: Sigvart Hovland <sigvart.hovland@nordicsemi.no>
1 file changed